CN111223725A - Circuit breaker and control method - Google Patents
Circuit breaker and control method Download PDFInfo
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- CN111223725A CN111223725A CN202010140058.1A CN202010140058A CN111223725A CN 111223725 A CN111223725 A CN 111223725A CN 202010140058 A CN202010140058 A CN 202010140058A CN 111223725 A CN111223725 A CN 111223725A
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- signal
- circuit breaker
- tripper
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- controller
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 26
- 230000009471 action Effects 0.000 claims description 13
- 238000001914 filtration Methods 0.000 abstract 1
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000009795 derivation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- Breakers (AREA)
Abstract
The invention provides a circuit breaker and a control method, wherein the circuit breaker comprises: the built-in controller is connected with the tripper through the relay contact and is used for sending a control signal to the tripper and providing a power supply for the tripper; the signal interface is connected with the release through a relay contact and used for receiving a control signal and a power supply sent by the remote control terminal; the built-in controller is connected with the relay contact through a release interface in the built-in controller. By implementing the invention, a release slot position is arranged in the breaker, so that interference points are reduced, and the stability of the whole breaker is enhanced. Meanwhile, the relay is used for filtering disturbance signals, and misoperation of the release is reduced.
Description
Technical Field
The invention relates to the field of circuit breaking protection control, in particular to a circuit breaker and a control method.
Background
The circuit breaker has the characteristics of advanced structure, reliable performance, strong breaking capacity, attractive and small appearance and the like, is used for the overload and short-circuit protection of illumination, distribution lines and equipment of office buildings, houses and similar buildings, and can also be used for the infrequent on-off operation and conversion of the lines.
Most circuit breaker control system on the existing market has a plurality of releases, causes compact inner structure, can't install more auxiliary module, also is disturbed by the disturbance signal easily simultaneously, and a plurality of releases will produce a plurality of interference points, leads to the release malfunction easily for the stability of circuit breaker is relatively poor.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the internal structure of the circuit breaker is compact, multiple interference points are easily generated, and the stability of the circuit breaker is poor due to excessive internal releases of the circuit breaker, so as to provide a circuit breaker and a control method.
Therefore, the embodiment of the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a circuit breaker, including: the system comprises a built-in controller, a tripper, a relay and a signal interface, wherein the built-in controller is connected with the tripper through a relay contact and is used for sending a control signal to the tripper and providing a power supply for the tripper; the signal interface is connected with the release through a relay contact and used for receiving a control signal and a power supply sent by the remote control terminal; the built-in controller is connected with the relay contact through a release interface in the built-in controller.
In one embodiment, the method further comprises: and the switch is used for controlling the action of the breaker and indicating the working state of the breaker.
In one embodiment, the method further comprises: and the accessory slot position is used for installing the circuit breaker accessory.
In one embodiment, the built-in controller includes: the power supply module is used for providing power for the built-in controller and the release; the signal sampling module is used for collecting the open circuit protection signal; and the control module is used for sending a control signal to control the action of the release according to the open circuit protection signal.
In one embodiment, the signal sampling module includes: the leakage current signal sampling module is used for collecting leakage current signals; the current signal sampling module is used for collecting current signals; the voltage signal sampling module is used for collecting voltage signals; and the wiring board temperature signal sampling module is used for acquiring temperature signals of the wiring board and the contact.
In a second aspect, an embodiment of the present invention provides a method for controlling a circuit breaker, where the circuit breaker is controlled by a built-in controller and a remote control terminal, and the method includes: when the remote control terminal does not send an external shunt tripping signal, the built-in controller controls the action of the tripper and supplies power to the tripper; when the remote control terminal sends an external shunt tripping signal, the remote control terminal controls the action of the tripper and supplies power to the tripper.
In one embodiment, the remote control terminal sends a control signal to the release through the signal interface and provides power.
In one embodiment, when the remote control terminal does not send the external shunt tripping signal, the coil of the relay loses power; when the remote control terminal sends an external shunt tripping signal, the coil of the relay is electrified.
The technical scheme of the invention has the following advantages:
according to the circuit breaker and the control method provided by the invention, the tripper controlled by the built-in controller and the tripper controlled by the remote control terminal are combined into one, so that the use of one tripper is reduced, a slot position is formed in the circuit breaker switch, and a vacant position can be installed for other accessories. Meanwhile, the relay can filter disturbance signals, and misoperation of the release is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a diagram showing a specific example of the internal connection of a circuit breaker according to an embodiment of the present invention;
fig. 2(a) is a top view of a circuit breaker in an embodiment of the present invention;
fig. 2(b) is a schematic perspective view of a circuit breaker according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a specific example of a built-in controller of a circuit breaker according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a specific example of a circuit breaker signal sampling module according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a circuit breaker which can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, the motor and the like, and automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur. As shown in fig. 1, the circuit breaker includes: the intelligent control system comprises a built-in controller, a tripper J1, a relay K1 and a signal interface JP3, wherein the built-in controller is connected with the tripper J1 through a relay K1 contact and is used for sending a control signal to the tripper J1 and providing power for the tripper J1; the signal interface JP3 is connected with the tripper J1 through a relay K1 contact and used for receiving a control signal and a power supply sent by a remote control terminal; the built-in controller is connected with a relay K1 contact through a release interface JP2 in the built-in controller.
In this embodiment, the built-in controller is connected with the relay K1 through the internal release interface JP2, when the coil of the relay loses power, the contact 5 of the relay is closed with the contact 1, the contact 6 is closed with the contact 2, and at this time, the release interface JP2 is connected with the release J1 through the closed contact of the relay K1. The built-in controller is connected with the tripper J1 through a relay K1 contact and supplies power to the tripper J1. When the load is abnormal, the built-in controller is connected with a relay K1 contact through an internal release interface JP2, and sends a control signal to control a release J1 to open the circuit breaker so as to protect the rear-end load.
An external shunt tripping signal sent by a remote control terminal is transmitted into the circuit breaker through a signal interface JP3, when a coil of the relay is electrified, a contact 5 and a contact 3 of the relay are closed, a contact 6 and a contact 4 of the relay are closed, and at the moment, the signal interface JP3 is connected with a tripper J1 through a closing contact of a relay K1. When the external judgment requires intervention and load loop breaking, the remote control terminal sends an external shunt tripping signal, and the control tripper J1 is used for switching off the circuit breaker to protect the rear-end load. Meanwhile, the remote control terminal provides power for the release through the signal interface 3. The type of the release may be an electromagnetic release or an electronic release, which is only taken as an example and not limited thereto.
According to the circuit breaker provided by the invention, the tripper controlled by the built-in controller and the tripper controlled by the remote control terminal are combined into one, so that the use of one tripper is reduced, a slot position is formed in the switch of the circuit breaker, the free position can be installed for other accessories, one interference point is reduced by one tripper in the production, processing and using processes, and the stability of the whole circuit breaker is enhanced. Meanwhile, the relay filters disturbance signals according to the voltage and the voltage duration time, and misoperation of the release is reduced.
In an embodiment, as shown in fig. 2, (a) is a top view of the circuit breaker, and (b) is a schematic perspective view of the circuit breaker, the circuit breaker further includes: the switch 4 is used for controlling the action of the circuit breaker and indicating the working state of the circuit breaker; and the accessory slot position is used for installing the circuit breaker accessory. In this embodiment, the built-in controller 1 is connected to the relay 3 through a release interface JP2 inside the built-in controller, and sends a control signal to control the release 2. An accessory slot for mounting an accessory inside the circuit breaker, such as: a release, a switch, an alarm device and the like. The accessories of the circuit breaker are used as derivation and supplement of the functions of the circuit breaker, so that a control means is added to the circuit breaker, and the protection function is expanded. The tripper controlled by the built-in controller and the tripper controlled by the remote control terminal are combined into one, so that the occupation of the tripper in the accessory slot position 5 or the accessory slot position 6 is reduced, and the position is vacated for the installation of other accessories.
In one embodiment, as shown in fig. 3, the built-in controller includes: the device comprises a power module 1, a signal sampling module 2 and a control module 3, wherein the power module 1 is used for providing power for a built-in controller and a release; the signal sampling module 2 is used for collecting open circuit protection signals; and the control module 3 is used for sending a control signal to control the action of the release according to the open circuit protection signal. In this embodiment, the power module 1 not only supplies power to the built-in controller, but also supplies power to the trip through the trip interface JP 2. The control module 3 sends a control signal to the tripper J1 through the tripper interface JP2 according to the load abnormal protection signal collected by the signal sampling module 2, and controls the tripper J1 to open the circuit breaker to protect the rear-end load.
In one embodiment, as shown in fig. 4, the signal sampling module 2 includes: the leakage current signal sampling module 21 is used for acquiring a leakage current signal, and the leakage current signal sampling module 21 is used for acquiring a leakage current signal; a current signal sampling module 22 for collecting current signals; the voltage signal sampling module 23 is used for collecting voltage signals; and the wiring board temperature signal sampling module 24 is used for acquiring temperature signals of the wiring board and the contact. In this embodiment, the control module 3 determines whether it is necessary to send a control signal to control the release J1 to open the circuit breaker according to the collected leakage current signal, voltage signal, and the collected open-circuit protection signals such as the terminal board and contact temperature signal.
Example 2
The embodiment of the invention provides a circuit breaker control method, wherein a circuit breaker is controlled by a built-in controller and a remote control terminal, and the method comprises the following steps: when the remote control terminal does not send an external shunt tripping signal, the built-in controller controls the action of the tripper and supplies power to the tripper; when the remote control terminal sends an external shunt tripping signal, the remote control terminal controls the action of the tripper and supplies power to the tripper.
In this embodiment, when the remote control terminal does not send an external shunt tripping signal, when a load is abnormal, the built-in controller is connected with the contact of the relay K1 through the internal tripper interface JP2, at this time, the coil of the relay is in a power-off state, the contact 5 of the relay is closed with the contact 1, the contact 6 is closed with the contact 2, and at this time, the tripper interface JP2 is connected with the tripper J1 through the closing contact of the relay K1. The built-in controller is connected with a relay K1 contact through an internal release interface JP2, and sends a control signal to control a release J1 to open the circuit breaker so as to protect a rear-end load.
When the remote control terminal sends an external shunt tripping signal, the external shunt tripping signal sent by the remote control terminal is transmitted into the circuit breaker through the signal interface JP3, at the moment, the coil of the relay is in an electrified state, the contact 5 and the contact 3 of the relay are closed, the contact 6 and the contact 4 are closed, and at the moment, the signal interface JP3 is connected with the tripper J1 through the closed contact of the relay K1. When the external judgment requires intervention and load loop breaking, the remote control terminal sends an external shunt tripping signal, and the control tripper J1 is used for switching off the circuit breaker to protect the rear-end load.
In one embodiment, the remote control terminal sends a control signal to the release through the signal interface and provides power. In this embodiment, the remote control terminal sends an external shunt tripping signal through the signal interface JP3, controls the tripper J1 to open the circuit breaker, and provides power for the tripper J1.
In one embodiment, when the remote control terminal does not send the external shunt tripping signal, the coil of the relay loses power; when the remote control terminal sends an external shunt tripping signal, the coil of the relay is electrified. In this embodiment, when the remote control terminal does not send the external shunt tripping signal, at this time, the coil of the relay is in a power-off state, the contact 5 of the relay is closed to the contact 1, and the contact 6 is closed to the contact 2. When the remote control terminal sends an external shunt tripping signal, the coil of the relay is in an electrified state, the contact 5 and the contact 3 of the relay are closed, and the contact 6 and the contact 4 of the relay are closed.
According to the circuit breaker control method provided by the invention, when the remote control terminal does not send an external shunt tripping signal, the built-in controller controls the action of the tripper to open the circuit breaker; when the remote control terminal sends an external shunt tripping signal, the remote control terminal controls the tripper to act to open the circuit breaker, the tripper controlled by the built-in controller and the tripper controlled by the remote control terminal are combined into one, the use of one tripper is reduced, a slot position is vacant in the switch of the circuit breaker, vacant positions can be installed for other accessories, one less interference point is reduced by one tripper in the production, processing and using processes, and the stability of the whole circuit breaker is enhanced.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A circuit breaker, comprising: a built-in controller, a release, a relay and a signal interface, wherein,
the built-in controller is connected with the tripper through the relay contact and is used for sending a control signal to the tripper and providing a power supply for the tripper;
the signal interface is connected with the release through a relay contact and used for receiving a control signal and a power supply sent by the remote control terminal;
the built-in controller is connected with the relay contact through a release interface in the built-in controller.
2. The circuit breaker of claim 1, further comprising: and the switch is used for controlling the action of the breaker and indicating the working state of the breaker.
3. The circuit breaker of claim 2, further comprising: and the accessory slot position is used for installing the circuit breaker accessory.
4. The circuit breaker of claim 1, wherein the built-in controller comprises: a power supply module, a signal sampling module and a control module, wherein,
the power supply module is used for supplying power to the built-in controller and the release;
the signal sampling module is used for collecting the open circuit protection signal;
and the control module is used for sending a control signal to control the action of the release according to the open circuit protection signal.
5. The circuit breaker of claim 4, wherein the signal sampling module comprises: a leakage current signal sampling module, a voltage signal sampling module and a wiring board temperature signal sampling module, wherein,
the leakage current signal sampling module is used for collecting leakage current signals;
the current signal sampling module is used for collecting current signals;
the voltage signal sampling module is used for collecting voltage signals;
and the wiring board temperature signal sampling module is used for acquiring temperature signals of the wiring board and the contact.
6. A circuit breaker control method is characterized in that the circuit breaker is controlled by a built-in controller and a remote control terminal, and comprises the following steps:
when the remote control terminal does not send an external shunt tripping signal, the built-in controller controls the action of the tripper and supplies power to the tripper;
when the remote control terminal sends an external shunt tripping signal, the remote control terminal controls the action of the tripper and supplies power to the tripper.
7. The circuit breaker control method of claim 6, wherein the remote control terminal sends a control signal to the trip unit and provides power to the trip unit through the signal interface.
8. The circuit breaker control method according to claim 7,
when the remote control terminal does not send an external shunt tripping signal, the coil of the relay loses power;
when the remote control terminal sends an external shunt tripping signal, the coil of the relay is electrified.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010140058.1A CN111223725A (en) | 2020-03-03 | 2020-03-03 | Circuit breaker and control method |
| PCT/CN2020/114706 WO2021174802A1 (en) | 2020-03-03 | 2020-09-11 | Circuit breaker and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010140058.1A CN111223725A (en) | 2020-03-03 | 2020-03-03 | Circuit breaker and control method |
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| Publication Number | Publication Date |
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| CN111223725A true CN111223725A (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010140058.1A Pending CN111223725A (en) | 2020-03-03 | 2020-03-03 | Circuit breaker and control method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111223725A (en) |
| WO (1) | WO2021174802A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021174802A1 (en) * | 2020-03-03 | 2021-09-10 | 巨邦集团有限公司 | Circuit breaker and control method |
| CN113854185A (en) * | 2021-11-03 | 2021-12-31 | 灵汪(东莞)科技有限公司 | Pet haulage rope connecting device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597105B (en) * | 2022-03-17 | 2024-06-11 | 德力西电气有限公司 | Circuit breaker and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001112161A (en) * | 1999-09-13 | 2001-04-20 | Schneider Electric Ind Sa | Tripper, and breaker equipped therewith |
| CN203553078U (en) * | 2013-07-01 | 2014-04-16 | 施耐德电器工业公司 | Digital-analog electronic miniature circuit breaker |
| US20140355165A1 (en) * | 2013-06-04 | 2014-12-04 | Lsis Co., Ltd. | Control unit for circuit breaker and controlling method thereof |
| CN207517633U (en) * | 2017-10-31 | 2018-06-19 | 天津七所高科技有限公司 | A kind of air switch dropout control circuit |
| CN211125541U (en) * | 2020-03-03 | 2020-07-28 | 巨邦集团有限公司 | Circuit breaker |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4345292A (en) * | 1978-07-10 | 1982-08-17 | Eaton Corporation | Minimum size, integral, A.C. overload current sensing, remote power controller |
| CN101540244B (en) * | 2008-03-21 | 2013-05-29 | 浙江加西亚电子电器有限公司 | Tripping device |
| CN106159873A (en) * | 2015-03-10 | 2016-11-23 | 江苏苏益电器股份有限公司 | A kind of condition for validity evaluator of residual current circuit breaker automatic reclosing |
| CN109713652A (en) * | 2019-01-16 | 2019-05-03 | 安徽升隆电气有限公司 | A kind of fault electric arc breaker |
| CN111223725A (en) * | 2020-03-03 | 2020-06-02 | 巨邦集团有限公司 | Circuit breaker and control method |
-
2020
- 2020-03-03 CN CN202010140058.1A patent/CN111223725A/en active Pending
- 2020-09-11 WO PCT/CN2020/114706 patent/WO2021174802A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001112161A (en) * | 1999-09-13 | 2001-04-20 | Schneider Electric Ind Sa | Tripper, and breaker equipped therewith |
| US20140355165A1 (en) * | 2013-06-04 | 2014-12-04 | Lsis Co., Ltd. | Control unit for circuit breaker and controlling method thereof |
| CN203553078U (en) * | 2013-07-01 | 2014-04-16 | 施耐德电器工业公司 | Digital-analog electronic miniature circuit breaker |
| CN207517633U (en) * | 2017-10-31 | 2018-06-19 | 天津七所高科技有限公司 | A kind of air switch dropout control circuit |
| CN211125541U (en) * | 2020-03-03 | 2020-07-28 | 巨邦集团有限公司 | Circuit breaker |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021174802A1 (en) * | 2020-03-03 | 2021-09-10 | 巨邦集团有限公司 | Circuit breaker and control method |
| CN113854185A (en) * | 2021-11-03 | 2021-12-31 | 灵汪(东莞)科技有限公司 | Pet haulage rope connecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021174802A1 (en) | 2021-09-10 |
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